'unstoppable' originates from the prefix 'un-' meaning 'not' and the word 'stop,' which comes from Old English 'stoppian,' meaning 'to block or close.'

'stop' changed from the Old English word 'stoppian' and eventually became the modern English word 'stop.'

Initially, it meant 'to block or close,' but over time it evolved into its current meaning of 'cease movement or action.'